Question

the measure of an angle is 78°. what is the measure of its complementary angle?

Explanation:

Step1: Recall complementary - angle definition

Complementary angles add up to 90°.

Step2: Calculate the complementary angle

Let the complementary angle be \(x\). We have \(x + 78^{\circ}=90^{\circ}\), so \(x=90^{\circ}-78^{\circ}\).

Answer:

\(12^{\circ}\)